People don't go to Dublin just for the Guinness, but an awful lot of folks have one while they are there. You eat a hot dog in NYC. You drink coffee and have a roll in a cafe in Paris. You eat a steak in Argentina and a Laksa in Malaysia. You have a Guinness in Dublin. I don't even like Guinness, but I 'had to' have one while in Dublin, the same as I 'have to' have one on St Pats Day. It's part of the experience.

And even if you do not drink one, it is an instant icon of the city.

I think the problem may be you have too tight a hold on yourself. Or bits of yourself.